An efficient, accurate algorithm for calculating CO<sub>2</sub> 15 μm band cooling rates

Fels, Stephen B.; Schwarzkopf, Malte

doi:10.1029/jc086ic02p01205

Cited by 121 publications

(50 citation statements)

References 26 publications

(3 reference statements)

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“…In our LBL model, a four-point Gaussian quadrature method [Fels and Schwarzkopf, 1981] is used to perform the angular integration to obtain the OLR and DLR.…”

Section: Longwave Radiative Transfer Formulationmentioning

confidence: 99%

“…Our analysis focuses on the Outgoing Longwave Radiation (OLR) at the Top of the Atmosphere (TOA) and Downward Longwave Radiation (DLR) at the surface under clear skies. We employ the Line-by-line (LBL) radiative transfer model of the Geophysical Fluid Dynamical Laboratory (GFDL) [Fels and Schwarzkopf, 1981;Schwarzkopf and Ramaswamy, 1999] for the computations.…”

Section: Introductionmentioning

confidence: 99%

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Effect of the temperature dependence of gas absorption in climate feedback

Huang

Ramaswamy

2007

J. Geophys. Res.

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[1] In the context of climate feedback associated with temperature change, there exist two potential mechanisms that affect the outgoing longwave radiation (OLR) and the downward longwave radiation (DLR). One is the ''Planck'' effect that determines the blackbody thermal emission at a considered temperature. The other is the ''absorptivity'' effect, in which a temperature change causes a change in gas absorptivities and thus influences the longwave radiative transfer. By using the line-by-line computed radiative Jacobians, which quantify the sensitivity of the radiative fluxes to a perturbation in the atmospheric temperature, the absorptivity effect is separated from the Planck effect. The absorptivity effect is further partitioned into components, with each one having a distinct physical meaning. It is demonstrated that the absorptivity-induced changes in the longwave radiation are individually significant even though the net effect is largely one of cancellation. As a consequence, the Planck effect dominates the overall OLR and DLR sensitivities to temperature change. The absorptivity effect tends to counteract the Planck effect. This tendency is particularly significant for the DLR and is more prominent for a warmer climate, with the result being a reduction in the surface warming.Citation: Huang, Y., and V. Ramaswamy (2007), Effect of the temperature dependence of gas absorption in climate feedback,

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“…In our LBL model, a four-point Gaussian quadrature method [Fels and Schwarzkopf, 1981] is used to perform the angular integration to obtain the OLR and DLR.…”

Section: Longwave Radiative Transfer Formulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of the temperature dependence of gas absorption in climate feedback

Huang

Ramaswamy

2007

J. Geophys. Res.

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“…With a view to understanding the interaction between model physics and aerosol radiative effects, we have conducted another set of simulations both with and without aerosol forcing and using the Kuo cumulus parameterization scheme (Anthes, 1977). The model's shortwave radiation scheme is based on Lacis and Hansen (1974) and the longwave radiation scheme is based on Fels and Schwarzkopf (1981). It uses a simple one layer bucket model for the surface hydrology calculation (Pan and Mahrt, 1986).…”

Section: Model Descriptionmentioning

confidence: 99%

Impact of absorbing aerosols on the simulation of climate over the Indian region in an atmospheric general circulation model

et al. 2004

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Abstract. The impact of anthropogenic absorbing aerosols (such as soot) on the climate over the Indian region has been studied using the NCMRWF general circulation model. The absorbing aerosols increase shortwave radiative heating of the lower troposphere and reduce the heating at the surface. These effects have been incorporated as heating of the lower troposphere (up to 700 hPa) and cooling over the continental surface based on INDOEX measurements. The heating effect is constant in the pre-monsoon season and reduces to zero during the monsoon season. It is shown that even in the monsoon season when the aerosol forcing is zero, there is an overall increase in rainfall and a reduction in surface temperature over the Indian region. The rainfall averaged over the Tropics shows a small reduction in most of the months during the January to September period.The impact of aerosol forcing, the model's sensitivity to this forcing and its interaction with model-physics has been studied by changing the cumulus parameterization from the Simplified Arakawa-Schubert (SAS) scheme to the Kuo scheme. During the pre-monsoon season the major changes in precipitation occur in the oceanic Inter Tropical Convergence Zone (ITCZ), where both the schemes show an increase in precipitation. This result is similar to that reported in Chung et al. (2002). On the other hand, during the monsoon season the changes in precipitation in the continental region are different in the SAS and Kuo schemes. It is shown that the heating due to absorbing aerosols changes the vertical moist-static stability of the atmosphere. The difference in the precipitation changes in the two cumulus schemes is on account of the different responses in the two parameterization schemes to changes in vertical stability.

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“…Because a complete description of the present line-by-line model has been published elsewhere [Drayson, 1967;Fels and Schwarzkopf, 1981], only a brief review of its features will be outlined here. A few important differences in its use will also be noted.…”

Section: The Line-by-line Modelmentioning

confidence: 99%

“…Complete, selfconsistent numerical models of the thermal structures and dynamical states of these atmospheres therefore require reliable descriptions of the transmission within this band. The most versatile and accurate methods for finding this transmission are the line-by-line models, such as those described by Drayson [1967] and Fels and Schwarzkopf [1981]. These methods are called "exact," since they can employ all available information about absorption lines shapes, strengths, and positions, and their accuracy is limited primarily by uncertainties in these line parameters.…”

Section: Introductionmentioning

confidence: 99%

Approximate methods for finding CO₂ 15‐μm band transmission in planetary atmospheres

Crisp¹,

Fels²,

Schwarzkopf³

1986

J. Geophys. Res.

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The CO 2 15-/•m band provides an important source of thermal opacity in the atmospheres of Venus, Earth, and Mars. Efficient and accurate methods for finding the transmission in this band are therefore needed before complete, self-consistent physical models of these atmospheres can be developed. In this paper we describe a hierarchy of such methods. The most versatile and accurate of these is an "

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An efficient, accurate algorithm for calculating CO₂ 15 μm band cooling rates

Cited by 121 publications

References 26 publications

Effect of the temperature dependence of gas absorption in climate feedback

Effect of the temperature dependence of gas absorption in climate feedback

Impact of absorbing aerosols on the simulation of climate over the Indian region in an atmospheric general circulation model

Approximate methods for finding CO₂ 15‐μm band transmission in planetary atmospheres

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An efficient, accurate algorithm for calculating CO2 15 μm band cooling rates

Cited by 121 publications

References 26 publications

Effect of the temperature dependence of gas absorption in climate feedback

Effect of the temperature dependence of gas absorption in climate feedback

Impact of absorbing aerosols on the simulation of climate over the Indian region in an atmospheric general circulation model

Approximate methods for finding CO2 15‐μm band transmission in planetary atmospheres

Contact Info

Product

Resources

About

An efficient, accurate algorithm for calculating CO₂ 15 μm band cooling rates

Approximate methods for finding CO₂ 15‐μm band transmission in planetary atmospheres